2007-11-07 19:54:35 +01:00
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/****************************************************************************
|
2014-06-26 21:02:08 +02:00
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* net/tcp/tcp_send.c
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2007-11-07 19:54:35 +01:00
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*
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2019-08-26 18:16:43 +02:00
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* Copyright (C) 2007-2010, 2012, 2015, 2018-2019 Gregory Nutt. All rights
|
2018-06-24 22:46:12 +02:00
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* reserved.
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2012-02-23 16:53:27 +01:00
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* Author: Gregory Nutt <gnutt@nuttx.org>
|
2007-11-07 19:54:35 +01:00
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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>
|
2007-11-22 19:36:46 +01:00
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#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
|
2007-11-07 19:54:35 +01:00
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|
2021-06-01 10:03:57 +02:00
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#include <assert.h>
|
2009-12-15 15:53:45 +01:00
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#include <stdint.h>
|
2007-12-11 15:27:11 +01:00
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#include <string.h>
|
2007-11-07 19:54:35 +01:00
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#include <debug.h>
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|
|
|
2014-06-24 16:53:28 +02:00
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#include <nuttx/net/netconfig.h>
|
2014-06-24 17:28:44 +02:00
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#include <nuttx/net/netdev.h>
|
2014-06-26 17:32:39 +02:00
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#include <nuttx/net/netstats.h>
|
2014-07-05 03:13:08 +02:00
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#include <nuttx/net/ip.h>
|
2014-07-06 20:34:27 +02:00
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#include <nuttx/net/tcp.h>
|
2007-11-07 19:54:35 +01:00
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|
2021-06-01 10:03:57 +02:00
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#include "netdev/netdev.h"
|
2014-06-29 02:07:02 +02:00
|
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#include "devif/devif.h"
|
2017-08-07 21:03:23 +02:00
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#include "inet/inet.h"
|
2014-07-06 20:34:27 +02:00
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#include "tcp/tcp.h"
|
2014-06-28 01:51:32 +02:00
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#include "utils/utils.h"
|
2007-11-07 19:54:35 +01:00
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
|
2015-01-18 15:56:05 +01:00
|
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* Name: tcp_header
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*
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* Description:
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* Get the length of the IP header
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*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2015-01-18 15:56:05 +01:00
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|
* dev - The device driver structure to use in the send operation
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*
|
2018-02-01 17:00:02 +01:00
|
|
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* Returned Value:
|
2015-01-18 15:56:05 +01:00
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|
* The length of the IP header (IPv4_HDRLEN or IPv6_HDRLEN)
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*
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|
****************************************************************************/
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static inline FAR struct tcp_hdr_s *tcp_header(FAR struct net_driver_s *dev)
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{
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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if (IFF_IS_IPv6(dev->d_flags))
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|
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|
#endif
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|
{
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return TCPIPv6BUF;
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}
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#endif /* CONFIG_NET_IPv6 */
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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else
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|
#endif
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{
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return TCPIPv4BUF;
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}
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#endif /* CONFIG_NET_IPv4 */
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}
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|
/****************************************************************************
|
|
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|
* Name: tcp_sendcomplete, tcp_ipv4_sendcomplete, and tcp_ipv6_sendcomplete
|
2007-11-07 19:54:35 +01:00
|
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*
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|
|
|
* Description:
|
|
|
|
* Complete the final portions of the send operation. This function sets
|
|
|
|
* up IP header and computes the TCP checksum
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2014-04-12 20:13:01 +02:00
|
|
|
* dev - The device driver structure to use in the send operation
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2007-11-07 19:54:35 +01:00
|
|
|
* None
|
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|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2007-11-07 19:54:35 +01:00
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|
*
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|
|
|
****************************************************************************/
|
|
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|
|
2015-01-18 15:56:05 +01:00
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|
|
#ifdef CONFIG_NET_IPv4
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static inline void tcp_ipv4_sendcomplete(FAR struct net_driver_s *dev,
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FAR struct tcp_hdr_s *tcp,
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|
FAR struct ipv4_hdr_s *ipv4)
|
2007-11-07 19:54:35 +01:00
|
|
|
{
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Set up some IP header fields that are needed for TCP checksum
|
|
|
|
* calculation.
|
|
|
|
*/
|
2009-03-08 15:42:36 +01:00
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|
2015-01-18 15:56:05 +01:00
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|
ipv4->proto = IP_PROTO_TCP;
|
2021-04-13 04:21:02 +02:00
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|
ipv4->ttl = IP_TTL_DEFAULT;
|
2019-09-06 17:48:42 +02:00
|
|
|
ipv4->vhl = 0x45;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-22 19:10:16 +01:00
|
|
|
/* At this point the TCP header holds the size of the payload, the
|
|
|
|
* TCP header, and the IP header.
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|
*/
|
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|
2015-01-18 15:56:05 +01:00
|
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|
ipv4->len[0] = (dev->d_len >> 8);
|
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ipv4->len[1] = (dev->d_len & 0xff);
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Calculate TCP checksum. */
|
2007-11-07 19:54:35 +01:00
|
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|
|
2015-01-18 15:56:05 +01:00
|
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|
tcp->urgp[0] = 0;
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|
|
|
tcp->urgp[1] = 0;
|
2007-11-07 19:54:35 +01:00
|
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|
|
2015-01-18 15:56:05 +01:00
|
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|
tcp->tcpchksum = 0;
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|
|
tcp->tcpchksum = ~tcp_ipv4_chksum(dev);
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Finish initializing the IP header and calculate the IP checksum */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
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|
ipv4->vhl = 0x45;
|
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|
|
ipv4->tos = 0;
|
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|
|
ipv4->ipoffset[0] = 0;
|
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|
|
ipv4->ipoffset[1] = 0;
|
|
|
|
++g_ipid;
|
|
|
|
ipv4->ipid[0] = g_ipid >> 8;
|
|
|
|
ipv4->ipid[1] = g_ipid & 0xff;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Calculate IP checksum. */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
ipv4->ipchksum = 0;
|
|
|
|
ipv4->ipchksum = ~ipv4_chksum(dev);
|
2015-01-21 17:29:18 +01:00
|
|
|
|
2016-06-20 19:59:15 +02:00
|
|
|
ninfo("IPv4 length: %d\n", ((int)ipv4->len[0] << 8) + ipv4->len[1]);
|
2015-01-24 15:26:12 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
|
|
g_netstats.ipv4.sent++;
|
|
|
|
#endif
|
2015-01-18 15:56:05 +01:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/****************************************************************************
|
2015-01-22 17:09:10 +01:00
|
|
|
* Name: tcp_ipv6_sendcomplete
|
2015-01-18 15:56:05 +01:00
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Complete the final portions of the send operation. This function sets
|
|
|
|
* up IP header and computes the TCP checksum
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2015-01-18 15:56:05 +01:00
|
|
|
* dev - The device driver structure to use in the send operation
|
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2015-01-18 15:56:05 +01:00
|
|
|
* None
|
|
|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2015-01-18 15:56:05 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
2015-01-18 15:56:05 +01:00
|
|
|
static inline void tcp_ipv6_sendcomplete(FAR struct net_driver_s *dev,
|
|
|
|
FAR struct tcp_hdr_s *tcp,
|
|
|
|
FAR struct ipv6_hdr_s *ipv6)
|
|
|
|
{
|
|
|
|
uint16_t iplen;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Set up some IP header fields that are needed for TCP checksum
|
|
|
|
* calculation.
|
|
|
|
*/
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
ipv6->proto = IP_PROTO_TCP;
|
2021-04-13 04:21:02 +02:00
|
|
|
ipv6->ttl = IP_TTL_DEFAULT;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-22 19:10:16 +01:00
|
|
|
/* At this point the TCP header holds the size of the payload, the
|
|
|
|
* TCP header, and the IP header. For IPv6, the IP length field does
|
|
|
|
* not include the size of IPv6 IP header length.
|
2015-01-18 15:56:05 +01:00
|
|
|
*/
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
iplen = dev->d_len - IPv6_HDRLEN;
|
|
|
|
ipv6->len[0] = (iplen >> 8);
|
|
|
|
ipv6->len[1] = (iplen & 0xff);
|
|
|
|
|
|
|
|
/* Calculate TCP checksum. */
|
|
|
|
|
|
|
|
tcp->urgp[0] = 0;
|
|
|
|
tcp->urgp[1] = 0;
|
|
|
|
|
|
|
|
tcp->tcpchksum = 0;
|
|
|
|
tcp->tcpchksum = ~tcp_ipv6_chksum(dev);
|
|
|
|
|
|
|
|
/* Finish initializing the IP header (no IPv6 checksum) */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
ipv6->vtc = 0x60;
|
|
|
|
ipv6->tcf = 0x00;
|
|
|
|
ipv6->flow = 0x00;
|
2015-01-21 17:29:18 +01:00
|
|
|
|
2016-06-20 19:59:15 +02:00
|
|
|
ninfo("IPv6 length: %d\n", ((int)ipv6->len[0] << 8) + ipv6->len[1]);
|
2015-01-24 15:26:12 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
|
|
g_netstats.ipv6.sent++;
|
|
|
|
#endif
|
2015-01-18 15:56:05 +01:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: tcp_sendcomplete
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Complete the final portions of the send operation. This function sets
|
|
|
|
* up IP header and computes the TCP checksum
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2015-01-18 15:56:05 +01:00
|
|
|
* dev - The device driver structure to use in the send operation
|
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2015-01-18 15:56:05 +01:00
|
|
|
* None
|
|
|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2015-01-18 15:56:05 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
static void tcp_sendcomplete(FAR struct net_driver_s *dev,
|
|
|
|
FAR struct tcp_hdr_s *tcp)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
if (IFF_IS_IPv6(dev->d_flags))
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
tcp_ipv6_sendcomplete(dev, tcp, IPv6BUF);
|
|
|
|
}
|
2007-11-07 19:54:35 +01:00
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
tcp_ipv4_sendcomplete(dev, tcp, IPv4BUF);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
|
2016-06-20 19:59:15 +02:00
|
|
|
ninfo("Outgoing TCP packet length: %d bytes\n", dev->d_len);
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
2014-06-26 17:32:39 +02:00
|
|
|
g_netstats.tcp.sent++;
|
2007-11-07 19:54:35 +01:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
2014-06-25 02:12:49 +02:00
|
|
|
* Name: tcp_sendcommon
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* We're done with the input processing. We are now ready to send a reply
|
|
|
|
* Our job is to fill in all the fields of the TCP and IP headers before
|
|
|
|
* calculating the checksum and finally send the packet.
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2014-04-12 20:13:01 +02:00
|
|
|
* dev - The device driver structure to use in the send operation
|
|
|
|
* conn - The TCP connection structure holding connection information
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2007-11-07 19:54:35 +01:00
|
|
|
* None
|
|
|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2014-06-28 00:48:12 +02:00
|
|
|
static void tcp_sendcommon(FAR struct net_driver_s *dev,
|
2015-01-18 15:56:05 +01:00
|
|
|
FAR struct tcp_conn_s *conn,
|
|
|
|
FAR struct tcp_hdr_s *tcp)
|
2007-11-07 19:54:35 +01:00
|
|
|
{
|
2015-01-22 17:09:10 +01:00
|
|
|
/* Copy the IP address into the IPv6 header */
|
2009-03-08 15:42:36 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
if (IFF_IS_IPv6(dev->d_flags))
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
|
2018-06-24 22:46:12 +02:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr);
|
|
|
|
net_ipv6addr_hdrcopy(ipv6->destipaddr, conn->u.ipv6.raddr);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
|
2018-06-24 22:46:12 +02:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
net_ipv4addr_hdrcopy(ipv4->srcipaddr, &dev->d_ipaddr);
|
|
|
|
net_ipv4addr_hdrcopy(ipv4->destipaddr, &conn->u.ipv4.raddr);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
|
|
|
|
/* Set TCP sequence numbers and port numbers */
|
|
|
|
|
|
|
|
memcpy(tcp->ackno, conn->rcvseq, 4);
|
|
|
|
memcpy(tcp->seqno, conn->sndseq, 4);
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp->srcport = conn->lport;
|
|
|
|
tcp->destport = conn->rport;
|
|
|
|
|
|
|
|
/* Set the TCP window */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2014-07-07 00:10:26 +02:00
|
|
|
if (conn->tcpstateflags & TCP_STOPPED)
|
2007-11-07 19:54:35 +01:00
|
|
|
{
|
2014-07-07 00:10:26 +02:00
|
|
|
/* If the connection has issued TCP_STOPPED, we advertise a zero
|
2007-11-07 19:54:35 +01:00
|
|
|
* window so that the remote host will stop sending data.
|
|
|
|
*/
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp->wnd[0] = 0;
|
|
|
|
tcp->wnd[1] = 0;
|
2007-11-07 19:54:35 +01:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2018-07-01 04:50:07 +02:00
|
|
|
/* Update the TCP received window based on I/O buffer availability */
|
|
|
|
|
2021-06-01 09:57:00 +02:00
|
|
|
uint32_t rcvseq = tcp_getsequence(conn->rcvseq);
|
2021-07-07 06:01:25 +02:00
|
|
|
uint32_t recvwndo = tcp_get_recvwindow(dev, conn);
|
2018-07-01 04:50:07 +02:00
|
|
|
|
2021-07-05 11:28:11 +02:00
|
|
|
/* Update the Receiver Window */
|
|
|
|
|
|
|
|
conn->rcv_adv = rcvseq + recvwndo;
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_TCP_WINDOW_SCALE
|
|
|
|
recvwndo >>= conn->rcv_scale;
|
|
|
|
#endif
|
|
|
|
|
2018-07-01 04:50:07 +02:00
|
|
|
/* Set the TCP Window */
|
|
|
|
|
2018-07-01 15:59:33 +02:00
|
|
|
tcp->wnd[0] = recvwndo >> 8;
|
|
|
|
tcp->wnd[1] = recvwndo & 0xff;
|
2007-11-07 19:54:35 +01:00
|
|
|
}
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Finish the IP portion of the message and calculate checksums */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp_sendcomplete(dev, tcp);
|
2022-01-02 16:53:43 +01:00
|
|
|
|
|
|
|
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
|
|
|
|
if ((tcp->flags & (TCP_SYN | TCP_FIN)) != 0)
|
|
|
|
{
|
|
|
|
/* Remember sndseq that will be used in case of a possible
|
|
|
|
* SYN or FIN retransmission
|
|
|
|
*/
|
|
|
|
|
|
|
|
conn->rexmit_seq = tcp_getsequence(conn->sndseq);
|
|
|
|
|
|
|
|
/* Advance sndseq by +1 because SYN and FIN occupy
|
|
|
|
* one sequence number (RFC 793)
|
|
|
|
*/
|
|
|
|
|
|
|
|
net_incr32(conn->sndseq, 1);
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
/* REVISIT for the buffered mode */
|
|
|
|
#endif
|
2007-11-07 19:54:35 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
2014-06-25 02:12:49 +02:00
|
|
|
* Name: tcp_send
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Setup to send a TCP packet
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2007-11-07 19:54:35 +01:00
|
|
|
* dev - The device driver structure to use in the send operation
|
|
|
|
* conn - The TCP connection structure holding connection information
|
|
|
|
* flags - flags to apply to the TCP header
|
2015-01-22 19:10:16 +01:00
|
|
|
* len - length of the message (includes the length of the IP and TCP
|
|
|
|
* headers)
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2007-11-07 19:54:35 +01:00
|
|
|
* None
|
|
|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2014-06-28 00:48:12 +02:00
|
|
|
void tcp_send(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
2014-06-25 02:12:49 +02:00
|
|
|
uint16_t flags, uint16_t len)
|
2007-11-07 19:54:35 +01:00
|
|
|
{
|
2015-01-18 15:56:05 +01:00
|
|
|
FAR struct tcp_hdr_s *tcp = tcp_header(dev);
|
2009-03-08 15:42:36 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp->flags = flags;
|
2007-11-07 19:54:35 +01:00
|
|
|
dev->d_len = len;
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp->tcpoffset = (TCP_HDRLEN / 4) << 4;
|
|
|
|
tcp_sendcommon(dev, conn, tcp);
|
2007-11-07 19:54:35 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
2014-06-25 02:12:49 +02:00
|
|
|
* Name: tcp_reset
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Send a TCP reset (no-data) message
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2007-11-07 19:54:35 +01:00
|
|
|
* dev - The device driver structure to use in the send operation
|
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2007-11-07 19:54:35 +01:00
|
|
|
* None
|
|
|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2014-06-28 00:48:12 +02:00
|
|
|
void tcp_reset(FAR struct net_driver_s *dev)
|
2007-11-07 19:54:35 +01:00
|
|
|
{
|
2015-01-18 15:56:05 +01:00
|
|
|
FAR struct tcp_hdr_s *tcp = tcp_header(dev);
|
2019-08-26 18:16:43 +02:00
|
|
|
uint32_t ackno;
|
2009-12-15 15:53:45 +01:00
|
|
|
uint16_t tmp16;
|
2019-08-26 18:16:43 +02:00
|
|
|
uint16_t acklen = 0;
|
2014-04-12 20:13:01 +02:00
|
|
|
uint8_t seqbyte;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
2014-06-26 17:32:39 +02:00
|
|
|
g_netstats.tcp.rst++;
|
2007-11-07 19:54:35 +01:00
|
|
|
#endif
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* TCP setup */
|
|
|
|
|
2019-08-26 18:16:43 +02:00
|
|
|
if ((tcp->flags & TCP_SYN) != 0 || (tcp->flags & TCP_FIN) != 0)
|
|
|
|
{
|
|
|
|
acklen++;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
2019-08-28 00:20:39 +02:00
|
|
|
if (IFF_IS_IPv6(dev->d_flags))
|
2019-08-26 18:16:43 +02:00
|
|
|
#endif
|
|
|
|
{
|
|
|
|
FAR struct ipv6_hdr_s *ip = IPv6BUF;
|
|
|
|
acklen += (ip->len[0] << 8 | ip->len[1]);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
FAR struct ipv4_hdr_s *ip = IPv4BUF;
|
|
|
|
acklen += (ip->len[0] << 8) + ip->len[1] - (ip->vhl & 0x0f) * 4;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
|
|
|
|
acklen -= (tcp->tcpoffset >> 4) << 2;
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp->flags = TCP_RST | TCP_ACK;
|
|
|
|
tcp->tcpoffset = 5 << 4;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
/* Flip the seqno and ackno fields in the TCP header. */
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
seqbyte = tcp->seqno[3];
|
|
|
|
tcp->seqno[3] = tcp->ackno[3];
|
|
|
|
tcp->ackno[3] = seqbyte;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
seqbyte = tcp->seqno[2];
|
|
|
|
tcp->seqno[2] = tcp->ackno[2];
|
|
|
|
tcp->ackno[2] = seqbyte;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
seqbyte = tcp->seqno[1];
|
|
|
|
tcp->seqno[1] = tcp->ackno[1];
|
|
|
|
tcp->ackno[1] = seqbyte;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
seqbyte = tcp->seqno[0];
|
|
|
|
tcp->seqno[0] = tcp->ackno[0];
|
|
|
|
tcp->ackno[0] = seqbyte;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
/* We also have to increase the sequence number we are
|
|
|
|
* acknowledging. If the least significant byte overflowed, we need
|
|
|
|
* to propagate the carry to the other bytes as well.
|
|
|
|
*/
|
|
|
|
|
2019-08-26 18:16:43 +02:00
|
|
|
ackno = tcp_addsequence(tcp->ackno, acklen);
|
|
|
|
|
|
|
|
tcp_setsequence(tcp->ackno, ackno);
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
/* Swap port numbers. */
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tmp16 = tcp->srcport;
|
|
|
|
tcp->srcport = tcp->destport;
|
|
|
|
tcp->destport = tmp16;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2021-06-29 15:49:39 +02:00
|
|
|
/* Initialize the rest of the tcp header to sane values.
|
|
|
|
*
|
|
|
|
* Note: urgp is set by tcp_ipv4_sendcomplete/tcp_ipv6_sendcomplete.
|
|
|
|
*/
|
|
|
|
|
|
|
|
tcp->wnd[0] = 0;
|
|
|
|
tcp->wnd[1] = 0;
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
/* Set the packet length and swap IP addresses. */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
if (IFF_IS_IPv6(dev->d_flags))
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
|
|
|
|
|
|
|
|
/* Set the packet length to the size of the IPv6 + TCP headers */
|
|
|
|
|
|
|
|
dev->d_len = IPv6TCP_HDRLEN;
|
|
|
|
|
|
|
|
/* Swap IPv6 addresses */
|
|
|
|
|
|
|
|
net_ipv6addr_hdrcopy(ipv6->destipaddr, ipv6->srcipaddr);
|
|
|
|
net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
|
|
|
|
|
|
|
|
/* Set the packet length to the size of the IPv4 + TCP headers */
|
|
|
|
|
|
|
|
dev->d_len = IPv4TCP_HDRLEN;
|
|
|
|
|
|
|
|
/* Swap IPv4 addresses */
|
|
|
|
|
|
|
|
net_ipv4addr_hdrcopy(ipv4->destipaddr, ipv4->srcipaddr);
|
|
|
|
net_ipv4addr_hdrcopy(ipv4->srcipaddr, &dev->d_ipaddr);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
/* And send out the RST packet */
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp_sendcomplete(dev, tcp);
|
2007-11-07 19:54:35 +01:00
|
|
|
}
|
|
|
|
|
2021-06-01 11:43:24 +02:00
|
|
|
/****************************************************************************
|
|
|
|
* Name: tcp_rx_mss
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Return the MSS to advertize to the peer.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* dev - The device driver structure
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* The MSS value.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
uint16_t tcp_rx_mss(FAR struct net_driver_s *dev)
|
|
|
|
{
|
|
|
|
uint16_t tcp_mss;
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
if (IFF_IS_IPv6(dev->d_flags))
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
tcp_mss = TCP_IPv6_MSS(dev);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
tcp_mss = TCP_IPv4_MSS(dev);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
|
|
|
|
return tcp_mss;
|
|
|
|
}
|
|
|
|
|
2007-11-07 19:54:35 +01:00
|
|
|
/****************************************************************************
|
2019-12-08 20:13:51 +01:00
|
|
|
* Name: tcp_synack
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
* Description:
|
2019-12-08 20:13:51 +01:00
|
|
|
* Send the SYN, ACK, or SYNACK response.
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
2019-12-11 18:19:32 +01:00
|
|
|
* - SYN and SYNACK are sent only from the TCP state machine.
|
|
|
|
* - ACK may be sent alone only if delayed ACKs are enabled and the ACK
|
|
|
|
* delay timeout occurs.
|
|
|
|
*
|
2018-03-13 16:52:27 +01:00
|
|
|
* Input Parameters:
|
2014-04-12 20:13:01 +02:00
|
|
|
* dev - The device driver structure to use in the send operation
|
|
|
|
* conn - The TCP connection structure holding connection information
|
|
|
|
* ack - The ACK response to send
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
2018-02-01 17:00:02 +01:00
|
|
|
* Returned Value:
|
2007-11-07 19:54:35 +01:00
|
|
|
* None
|
|
|
|
*
|
|
|
|
* Assumptions:
|
2017-03-28 22:08:54 +02:00
|
|
|
* Called with the network locked.
|
2007-11-07 19:54:35 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
2019-12-08 20:13:51 +01:00
|
|
|
void tcp_synack(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
|
|
|
uint8_t ack)
|
2007-11-07 19:54:35 +01:00
|
|
|
{
|
2022-01-17 23:09:14 +01:00
|
|
|
FAR struct tcp_hdr_s *tcp;
|
2015-01-18 15:56:05 +01:00
|
|
|
uint16_t tcp_mss;
|
2021-07-05 11:03:15 +02:00
|
|
|
int16_t optlen = 0;
|
2015-01-18 15:56:05 +01:00
|
|
|
|
|
|
|
/* Get values that vary with the underlying IP domain */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
if (IFF_IS_IPv6(dev->d_flags))
|
|
|
|
#endif
|
|
|
|
{
|
2021-06-01 11:43:24 +02:00
|
|
|
/* Get the offset TCP header address for this packet */
|
2015-01-18 15:56:05 +01:00
|
|
|
|
|
|
|
tcp = TCPIPv6BUF;
|
|
|
|
|
2017-05-11 21:35:56 +02:00
|
|
|
/* Set the packet length for the TCP Maximum Segment Size */
|
2015-01-18 15:56:05 +01:00
|
|
|
|
2021-07-05 11:03:15 +02:00
|
|
|
dev->d_len = IPv6TCP_HDRLEN;
|
2015-01-18 15:56:05 +01:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
2021-06-01 11:43:24 +02:00
|
|
|
/* Get the offset TCP header address for this packet */
|
2015-01-18 15:56:05 +01:00
|
|
|
|
|
|
|
tcp = TCPIPv4BUF;
|
|
|
|
|
2017-05-11 21:35:56 +02:00
|
|
|
/* Set the packet length for the TCP Maximum Segment Size */
|
2015-01-18 15:56:05 +01:00
|
|
|
|
2021-07-05 11:03:15 +02:00
|
|
|
dev->d_len = IPv4TCP_HDRLEN;
|
2015-01-18 15:56:05 +01:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
2009-03-08 15:42:36 +01:00
|
|
|
|
2021-06-01 11:43:24 +02:00
|
|
|
tcp_mss = tcp_rx_mss(dev);
|
|
|
|
|
2007-11-07 19:54:35 +01:00
|
|
|
/* Save the ACK bits */
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp->flags = ack;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2019-12-08 20:13:51 +01:00
|
|
|
/* We send out the TCP Maximum Segment Size option with our ACK. */
|
2007-11-07 19:54:35 +01:00
|
|
|
|
2021-07-05 11:03:15 +02:00
|
|
|
tcp->optdata[optlen++] = TCP_OPT_MSS;
|
|
|
|
tcp->optdata[optlen++] = TCP_OPT_MSS_LEN;
|
|
|
|
tcp->optdata[optlen++] = tcp_mss >> 8;
|
|
|
|
tcp->optdata[optlen++] = tcp_mss & 0xff;
|
2021-07-05 11:28:11 +02:00
|
|
|
|
|
|
|
#ifdef CONFIG_NET_TCP_WINDOW_SCALE
|
|
|
|
if (tcp->flags == TCP_SYN ||
|
|
|
|
((tcp->flags == (TCP_ACK | TCP_SYN)) && (conn->flags & TCP_WSCALE)))
|
|
|
|
{
|
|
|
|
tcp->optdata[optlen++] = TCP_OPT_NOOP;
|
|
|
|
tcp->optdata[optlen++] = TCP_OPT_WS;
|
|
|
|
tcp->optdata[optlen++] = TCP_OPT_WS_LEN;
|
|
|
|
tcp->optdata[optlen++] = CONFIG_NET_TCP_WINDOW_SCALE_FACTOR;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2021-07-05 11:03:15 +02:00
|
|
|
tcp->tcpoffset = ((TCP_HDRLEN + optlen) / 4) << 4;
|
|
|
|
dev->d_len += optlen;
|
2007-11-07 19:54:35 +01:00
|
|
|
|
|
|
|
/* Complete the common portions of the TCP message */
|
|
|
|
|
2015-01-18 15:56:05 +01:00
|
|
|
tcp_sendcommon(dev, conn, tcp);
|
2007-11-07 19:54:35 +01:00
|
|
|
}
|
|
|
|
|
2021-06-01 10:03:57 +02:00
|
|
|
/****************************************************************************
|
|
|
|
* Name: tcp_send_txnotify
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Notify the appropriate device driver that we are have data ready to
|
|
|
|
* be send (TCP)
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* psock - Socket state structure
|
|
|
|
* conn - The TCP connection structure
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* None
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
void tcp_send_txnotify(FAR struct socket *psock,
|
|
|
|
FAR struct tcp_conn_s *conn)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
/* If both IPv4 and IPv6 support are enabled, then we will need to select
|
|
|
|
* the device driver using the appropriate IP domain.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (psock->s_domain == PF_INET)
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
/* Notify the device driver that send data is available */
|
|
|
|
|
|
|
|
netdev_ipv4_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
else /* if (psock->s_domain == PF_INET6) */
|
|
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
{
|
|
|
|
/* Notify the device driver that send data is available */
|
|
|
|
|
|
|
|
DEBUGASSERT(psock->s_domain == PF_INET6);
|
|
|
|
netdev_ipv6_txnotify(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
}
|
|
|
|
|
2007-11-22 19:36:46 +01:00
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_TCP */
|