mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-16 14:07:36 +00:00
6463c91a4f
Adam Dunkels writes on 2/5/2017 on the Contiki mailing list: [...] the original idea was that the application could just point the uip_appdata pointer to wherever the data was, but we then changed it so that the data actually had to be copied into the uip_aligned_buf buffer. So, yes, the network device driver should only need to read from this buffer. [...] This change removes comments on the possibility of uip_appdata pointing somewhere outside the uip_aligned_buf. And it removes code in the SLIP drivers not necessary anymore. Additionally it makes code in a SLIP driver optional that takes care of the Microsoft-specific CLIENT / SERVER / CLIENTSERVER chat.
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2001, 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.
|
|
*
|
|
* This file is part of the uIP TCP/IP stack.
|
|
*
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Declarations of architecture specific functions.
|
|
* \author Adam Dunkels <adam@dunkels.com>
|
|
*/
|
|
|
|
/**
|
|
* \addtogroup uip
|
|
* {@
|
|
*/
|
|
|
|
/**
|
|
* \defgroup uiparch Architecture specific uIP functions
|
|
* @{
|
|
*
|
|
* The functions in the architecture specific module implement the IP
|
|
* check sum and 32-bit additions.
|
|
*
|
|
* The IP checksum calculation is the most computationally expensive
|
|
* operation in the TCP/IP stack and it therefore pays off to
|
|
* implement this in efficient assembler. The purpose of the uip-arch
|
|
* module is to let the checksum functions to be implemented in
|
|
* architecture specific assembler.
|
|
*
|
|
*/
|
|
|
|
#ifndef UIP_ARCH_H_
|
|
#define UIP_ARCH_H_
|
|
|
|
#include "net/ip/uip.h"
|
|
|
|
/**
|
|
* Carry out a 32-bit addition.
|
|
*
|
|
* Because not all architectures for which uIP is intended has native
|
|
* 32-bit arithmetic, uIP uses an external C function for doing the
|
|
* required 32-bit additions in the TCP protocol processing. This
|
|
* function should add the two arguments and place the result in the
|
|
* global variable uip_acc32.
|
|
*
|
|
* \note The 32-bit integer pointed to by the op32 parameter and the
|
|
* result in the uip_acc32 variable are in network byte order (big
|
|
* endian).
|
|
*
|
|
* \param op32 A pointer to a 4-byte array representing a 32-bit
|
|
* integer in network byte order (big endian).
|
|
*
|
|
* \param op16 A 16-bit integer in host byte order.
|
|
*/
|
|
void uip_add32(uint8_t *op32, uint16_t op16);
|
|
|
|
/**
|
|
* Calculate the Internet checksum over a buffer.
|
|
*
|
|
* The Internet checksum is the one's complement of the one's
|
|
* complement sum of all 16-bit words in the buffer.
|
|
*
|
|
* See RFC1071.
|
|
*
|
|
* \note This function is not called in the current version of uIP,
|
|
* but future versions might make use of it.
|
|
*
|
|
* \param data A pointer to the buffer over which the checksum is to be
|
|
* computed.
|
|
*
|
|
* \param len The length of the buffer over which the checksum is to
|
|
* be computed.
|
|
*
|
|
* \return The Internet checksum of the buffer.
|
|
*/
|
|
uint16_t uip_chksum(uint16_t *data, uint16_t len);
|
|
|
|
/**
|
|
* Calculate the IP header checksum of the packet header in uip_buf.
|
|
*
|
|
* The IP header checksum is the Internet checksum of the 20 bytes of
|
|
* the IP header.
|
|
*
|
|
* \return The IP header checksum of the IP header in the uip_buf
|
|
* buffer.
|
|
*/
|
|
uint16_t uip_ipchksum(void);
|
|
|
|
/**
|
|
* Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
|
|
*
|
|
* The TCP checksum is the Internet checksum of data contents of the
|
|
* TCP segment, and a pseudo-header as defined in RFC793.
|
|
*
|
|
* \return The TCP checksum of the TCP segment in uip_buf and pointed
|
|
* to by uip_appdata.
|
|
*/
|
|
uint16_t uip_tcpchksum(void);
|
|
|
|
uint16_t uip_udpchksum(void);
|
|
|
|
/** @} */
|
|
/** @} */
|
|
|
|
#endif /* UIP_ARCH_H_ */
|