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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2006-2019 B.A.T.M.A.N. contributors:
*
* Simon Wunderlich, Marek Lindner
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _NET_BATMAN_ADV_BITARRAY_H_
#define _NET_BATMAN_ADV_BITARRAY_H_
#include "main.h"
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/stddef.h>
#include <linux/types.h>
/**
* batadv_test_bit() - check if bit is set in the current window
*
* @seq_bits: pointer to the sequence number receive packet
* @last_seqno: latest sequence number in seq_bits
* @curr_seqno: sequence number to test for
*
* Return: true if the corresponding bit in the given seq_bits indicates true
* and curr_seqno is within range of last_seqno. Otherwise returns false.
*/
static inline bool batadv_test_bit(const unsigned long *seq_bits,
u32 last_seqno, u32 curr_seqno)
{
s32 diff;
diff = last_seqno - curr_seqno;
if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
return false;
return test_bit(diff, seq_bits) != 0;
}
/**
* batadv_set_bit() - Turn corresponding bit on, so we can remember that we got
* the packet
* @seq_bits: bitmap of the packet receive window
* @n: relative sequence number of newly received packet
*/
static inline void batadv_set_bit(unsigned long *seq_bits, s32 n)
{
/* if too old, just drop it */
if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
return;
set_bit(n, seq_bits); /* turn the position on */
}
bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
s32 seq_num_diff, int set_mark);
#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
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