57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/* Copyright (C) B.A.T.M.A.N. contributors:
|
||
|
|
*
|
||
|
|
* Simon Wunderlich, Marek Lindner
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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_ */
|