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rdc: duplicate packets: Factor out detection code

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The code detecting duplicate packets in the RDC layer had been copied into most
RDC implementations. Factor it out into a new mac-sequence module in order to
have a single instance of this code.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
This commit is contained in:
Benoît Thébaudeau 2013-11-15 19:21:41 +01:00
parent 14db3382af
commit 477a4a7178
6 changed files with 186 additions and 96 deletions
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66
core/net/mac/mac-sequence.h Normal file
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/*
* Copyright (c) 2010, Swedish Institute of Computer Science.
* All rights reserved.
*
* Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 Contiki operating system.
*
*/
/**
* \file
* Header file for MAC sequence numbers management
* \author
* Adam Dunkels <adam@sics.se>
* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
*/
#ifndef MAC_SEQUENCE_H
#define MAC_SEQUENCE_H
/**
* \brief Tell whether the packetbuf is a duplicate packet
* \return Non-zero if the packetbuf is a duplicate packet, zero otherwise
*
* This function is used to check for duplicate packet by comparing
* the sequence number of the incoming packet with the last few ones
* we saw, filtering with the Rime address.
*/
int mac_sequence_is_duplicate(void);
/**
* \brief Register the sequence number of the packetbuf
*
* This function is used to add the sequence number of the incoming
* packet to the history.
*/
void mac_sequence_register_seqno(void);
#endif /* MAC_SEQUENCE_H */