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369 lines
10 KiB
369 lines
10 KiB
/**************************************************************************** |
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* net/uip/uip_tcpsend.c |
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* |
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* Copyright (C) 2007-2010, 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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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 <stdint.h> |
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#include <string.h> |
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#include <debug.h> |
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#include <nuttx/net/uip/uipopt.h> |
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#include <nuttx/net/uip/uip.h> |
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#include <nuttx/net/uip/uip-arch.h> |
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#include "uip_internal.h" |
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/**************************************************************************** |
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* Pre-processor 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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struct uip_tcpip_hdr *pbuf = BUF; |
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pbuf->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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pbuf->len[0] = ((dev->d_len - UIP_IPH_LEN) >> 8); |
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pbuf->len[1] = ((dev->d_len - UIP_IPH_LEN) & 0xff); |
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#else /* CONFIG_NET_IPv6 */ |
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pbuf->len[0] = (dev->d_len >> 8); |
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pbuf->len[1] = (dev->d_len & 0xff); |
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#endif /* CONFIG_NET_IPv6 */ |
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pbuf->urgp[0] = pbuf->urgp[1] = 0; |
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/* Calculate TCP checksum. */ |
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pbuf->tcpchksum = 0; |
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pbuf->tcpchksum = ~(uip_tcpchksum(dev)); |
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#ifdef CONFIG_NET_IPv6 |
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pbuf->vtc = 0x60; |
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pbuf->tcf = 0x00; |
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pbuf->flow = 0x00; |
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#else /* CONFIG_NET_IPv6 */ |
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pbuf->vhl = 0x45; |
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pbuf->tos = 0; |
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pbuf->ipoffset[0] = 0; |
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pbuf->ipoffset[1] = 0; |
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++g_ipid; |
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pbuf->ipid[0] = g_ipid >> 8; |
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pbuf->ipid[1] = g_ipid & 0xff; |
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/* Calculate IP checksum. */ |
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pbuf->ipchksum = 0; |
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pbuf->ipchksum = ~(uip_ipchksum(dev)); |
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#endif /* CONFIG_NET_IPv6 */ |
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nllvdbg("Outgoing TCP packet length: %d (%d)\n", |
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dev->d_len, (pbuf->len[0] << 8) | pbuf->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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struct uip_tcpip_hdr *pbuf = BUF; |
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memcpy(pbuf->ackno, conn->rcvseq, 4); |
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memcpy(pbuf->seqno, conn->sndseq, 4); |
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pbuf->proto = UIP_PROTO_TCP; |
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pbuf->srcport = conn->lport; |
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pbuf->destport = conn->rport; |
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uiphdr_ipaddr_copy(pbuf->srcipaddr, &dev->d_ipaddr); |
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uiphdr_ipaddr_copy(pbuf->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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pbuf->wnd[0] = 0; |
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pbuf->wnd[1] = 0; |
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} |
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else |
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{ |
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pbuf->wnd[0] = ((CONFIG_NET_RECEIVE_WINDOW) >> 8); |
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pbuf->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, |
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uint16_t flags, uint16_t len) |
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{ |
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struct uip_tcpip_hdr *pbuf = BUF; |
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pbuf->flags = flags; |
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dev->d_len = len; |
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pbuf->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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struct uip_tcpip_hdr *pbuf = BUF; |
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uint16_t tmp16; |
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uint8_t 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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pbuf->flags = TCP_RST | TCP_ACK; |
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dev->d_len = UIP_IPTCPH_LEN; |
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pbuf->tcpoffset = 5 << 4; |
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/* Flip the seqno and ackno fields in the TCP header. */ |
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seqbyte = pbuf->seqno[3]; |
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pbuf->seqno[3] = pbuf->ackno[3]; |
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pbuf->ackno[3] = seqbyte; |
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seqbyte = pbuf->seqno[2]; |
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pbuf->seqno[2] = pbuf->ackno[2]; |
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pbuf->ackno[2] = seqbyte; |
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seqbyte = pbuf->seqno[1]; |
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pbuf->seqno[1] = pbuf->ackno[1]; |
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pbuf->ackno[1] = seqbyte; |
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seqbyte = pbuf->seqno[0]; |
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pbuf->seqno[0] = pbuf->ackno[0]; |
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pbuf->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 (++(pbuf->ackno[3]) == 0) |
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{ |
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if (++(pbuf->ackno[2]) == 0) |
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{ |
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if (++(pbuf->ackno[1]) == 0) |
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{ |
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++(pbuf->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 = pbuf->srcport; |
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pbuf->srcport = pbuf->destport; |
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pbuf->destport = tmp16; |
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/* Swap IP addresses. */ |
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uiphdr_ipaddr_copy(pbuf->destipaddr, pbuf->srcipaddr); |
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uiphdr_ipaddr_copy(pbuf->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_t ack) |
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{ |
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struct uip_tcpip_hdr *pbuf = BUF; |
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/* Save the ACK bits */ |
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pbuf->flags = ack; |
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/* We send out the TCP Maximum Segment Size option with our ack. */ |
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pbuf->optdata[0] = TCP_OPT_MSS; |
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pbuf->optdata[1] = TCP_OPT_MSS_LEN; |
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pbuf->optdata[2] = (UIP_TCP_MSS) / 256; |
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pbuf->optdata[3] = (UIP_TCP_MSS) & 255; |
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dev->d_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN; |
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pbuf->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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